Harris, David P.
Testing english as a second language
McGraw-Hill, 1969
 Buku Teks SO
Second language writing : research insights for the classroom
editedby Barbara Kroll
Cambridge University Press, 1990
 Buku Teks SO
Second language writing : research insights for the classroom
edited by Barbara Kroll
Cambridge University Press, 1990
 Buku Teks
Ohta, Amy Snyder
Second language aquisition process in the classroom learning Japanese
Lawrence Erlbaum Associates, 2001
 Buku Teks SO
Littlewood, William T.
Foreign and second language learning : language-acquisition research and its implications for the classroom
Cambridge University Press, 1994
 Buku Teks SO